Basal lvs ovate, 6-12 cm, crenate or obtusely serrate, rounded to cordate at base, palmately veined, long-petiolate; stems 2-4 dm, hairy; cauline lvs alternate, sessile or
nearly so, ovate or oblong, 1-2 cm; infl 5-15 cm; pedicels 1-2 mm; upper cor lip surpassing the villous cal, lower lip about equaling the cal, its middle lobe the smallest; fr 4-7 mm, hirsutulous. Sandy prairies and barrens; Mich. and O. to Minn. and Io., rare and local. May, June. (Synthyris b.; Wulfenia b.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.